<template>
    <div>
       <!-- 顶部滑动条区域 -->
       <div id="slider" class="mui-slider">
				<div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
					<div class="mui-scroll">
						<a :class="['mui-control-item',item.id==0?'mui-active':'']" v-for="item in cates" :key="item.id" @tap="getPhotoListByCateId(item.id)">
							{{item.title}}
						</a>
					</div>
				</div>

			</div>

			<!-- 图片列表区域 -->
		 <ul class="photo-list">
          <router-link v-for="item in list" :key="item.id" :to="'/home/photoinfo/' + item.id" tag="li">
               <img v-lazy="item.img_url">
			       <div class="info">
				       <h1 class="info-title">{{item.title}}</h1>
				       <div class="info-body">{{item.zhaiyao}}</div>
			       </div>
          </router-link>
        </ul>

    </div>
</template>

<script>
// 1.导入mui的js文件
import mui from '../../lib/mui/js/mui.min.js';


export default {
    data() {
      return { 
		  cates: [],  //所有分类列表的数组
		  list: []     //图片列表的数组
	  };
	},
	created(){
		this.getAllCategory();
		//默认进入页面，就主动请求所有图片列表的数据
		this.getPhotoListByCateId(0);     
	},
	mounted(){   //当组件中的DOM结构被渲染好并放到页面中后，会执行这个钩子函数
	//如果要操作元素了，最好在mounted里面，因为这里时候的DOM元素是最新的
       //2.初始化滑动控件
    mui(".mui-scroll-wrapper").scroll({   
	  deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
    });
	},
	methods:{
       getAllCategory(){
		   //获取所有的图片分类
		   this.$http.get('api/getimgcategory').then(result=>{
			   if(result.body.status===0){
				   //手动拼接出一个最完整的分类列表
				   result.body.message.unshift({title:"全部",id:0});
				   this.cates= result.body.message;
			   }
		   });
	   },
	   getPhotoListByCateId(cateId){
		 //根据分类Id获取图片列表
		 this.$http.get('api/getimages/'+cateId).then(result=>{
			 if(result.body.status===0){
				this.list=result.body.message; 
			 }
		 });
	   }
	}
};
</script>

<style lang="scss" scoped>
   * {
	  touch-action: pan-y; 
   }

   .photo-list {
	   list-style: none;
	   margin: 0;
	   padding: 10px;
	   padding-bottom: 0;
	   li{
		background-color: #ccc;
		text-align: center;
		margin-bottom: 10px;
		box-shadow: 0 0 9px #999;
		position: relative;
		img {
			width: 100%;
			vertical-align: middle;		
		}
    img[lazy="loading"] {
          width: 40px;
          height: 300px;
          margin: auto;
        } 
		.info{
			color: white;
			text-align: left;
			position: absolute;
			bottom: 0;
      background-color: rgba(0,0,0,0.4);
			max-height: 84px;
			.info-title{
				font-size: 14px;
			}
			.info-body{
				font-size: 13px;
			 }
	  	}
     }
    }


  
</style>